4CX350A/8321 - 350 W RADIAL BEAM POWER TETRODE

 Penta Labs 4CX350A: Robust Power for Audio & RF

The Penta Labs 4CX350A is a high-performance power tetrode designed for demanding Broadcast and RF amplifier applications. It offers 350 watts of maximum plate dissipation, making it well-suited for Class AB1 audio or RF amplifiers where both power and reliability are essential.

Internally, the 4CX350A is built to last. While externally identical to the 4CX250B, it boasts a ruggedized internal construction for improved durability and service life. Enhancements to its amplification factor and cathode area compared to the 4CX250B translate to higher transconductance and figure of merit, contributing to better overall performance.

Product Specifications:

• Maximum Plate Dissipation: 350 Watts
• Maximum Screen Dissipation: 8 Watts
• Maximum Grid Dissipation: 0 Watts
• Frequency for Max Rating (CW): 110 MHz
• Amplification Factor: 13
• Filament/Cathode: Oxide Coated
• Voltage: 6.0 Volts
• Current: 2.9 Amps
• Capacitance (Grounded Cathode):
  • Input: 23.6 pF
  • Output: 5.6 pF
  • Feedthrough: 0.3 pF
• Capacitance (Grounded Grid):
  • Not specified
• Cooling: Forced Air
• Base: 9-Pin Special
• Air Socket: SK-600A
• Air Chimney: SK-606
• Length: 2.47 in (62.60 mm)
• Diameter: 1.64 in (41.60 mm)
• Weight: 4 oz (113 gm)

Benefits:

• High power output (350W) for demanding applications
• Rugged internal construction for enhanced reliability and tube life
• Improved transconductance and figure of merit compared to 4CX250B
• Compact size suitable for various designs
• Ideal for broadcast and home-brew HF amplifier systems replacement parts.